Windshield Washer Fluid Heater - Checking For Corrosion

90mercedes04
TO: OUR MERCEDES-BENZ PASSENGER CAR

DATE: April 1990


SUBJECT: CHECKING RETAINING NUT ON WINDSHIELD WASHER HEATER FOR CORROSION MODEL R129
REF.NO. MBNA 82/44
Effective Serial Number


Model Chassis End Number
From To


R129 F 000001 F 003406


Note: Vehicles with a red paint dot on top of the windshield washer reservoir do not need to be checked.

Figure 1:

1. Pull electrical plug (1, Figure 1) from washer reservoir level indicator.

2. Unscrew knurled nut and washer (2). Lift out reservoir.

3. Unclip hose clamp (3).

Figure 2:

Figure 3:

5. Open cap and turn washer pump (4, Figure 2) upwards to free hose from guide, (do not remove heater coil completely).
6. Pull thermostat locating pin (5, Figure 3) out of guide.
7. Slip out heater coil (6) below washer pump.
8. Completely remove heater.
9. Check retaining nut (7) with a magnet. If the retaining nut is not attracted by the magnet, reinstall the removed parts in reverse sequence.


10. If the retaining nut is attracted by the magnet or if corrosion is visible, replace heater.

Note: Relieve coolant pressure by opening the cap of the expansion tank.

11. Loosen both hose claim on heater hose. Pull heater from hose and flush reservoir.
12. Install new heater.
13. For further installation, follow steps 1-7 in reverse order.
14. Fill reservoir with suggested ratio of concentrate "S" and water or premix depending upon season (see S.I.MBNA 82/23b, Oct. 1987). Activate washer pump until fluid squirts from washer nozzles.
15. Only on vehicles where engine coolant leaked out from windshield washer heater:
Renew coolant with antifreeze and check cooling system for leaks.

Important: Mark checked/repaired vehicles with a red paint dot on top of the windshield washer reservoir.
Parts Information


Qty. Part Name Part Number


1 Windshield washer
heater 129 830 05 61


In Case of Warranty:

Time Allowance
02-0646 Windshield washer heater retaining nut, check 0.2 hr. 90
02-0647 Windshield washer heater, replace 0.2 hr. 90

For vehicles where engine, coolant leaked out from windshield washer heater:
20-1142 Coolant mixture, replace-check for leaks 0.3 hr. 91
0.5 hr. 92

Damage Code
86017 Windshield washer fluid heater
86017 Windshield washer fluid heater, check/replace